[dm-devel] [PATCH v2 13/23] libmultipath: print: convert API to generic data type
Benjamin Marzinski
bmarzins at redhat.com
Wed Mar 7 19:02:30 UTC 2018
On Tue, Mar 06, 2018 at 12:14:57AM +0100, Martin Wilck wrote:
> Convert higher level API (snprint_multipath_topology() etc) to
> using the generic multipath API. This will allow "foreign"
> multipath objects that implement the generic API to be printed
> exactly like native multipathd objects.
>
> The previous API (using "struct multipath*" and "struct path" remains
> in place through macros mapping to the new functions. By doing this
> and testing in regular setups, it's easily verified that the new
> API works and produces the same results.
>
> Moreover, abstract out the code to determine the output format from multipath
> properties into snprint_multipath_style(), to be able to use it as generic
> ->style() method.
>
> Signed-off-by: Martin Wilck <mwilck at suse.com>
Reviewed-by: Benjamin Marzinski <bmarzins at redhat.com>
> ---
> libmultipath/configure.c | 1 +
> libmultipath/dm-generic.c | 2 +-
> libmultipath/print.c | 115 +++++++++++++++++++++++++++++-----------------
> libmultipath/print.h | 24 +++++++---
> multipath/main.c | 1 +
> multipathd/cli_handlers.c | 1 +
> 6 files changed, 95 insertions(+), 49 deletions(-)
>
> diff --git a/libmultipath/configure.c b/libmultipath/configure.c
> index 13e14cc25fff..42b7c896ee65 100644
> --- a/libmultipath/configure.c
> +++ b/libmultipath/configure.c
> @@ -30,6 +30,7 @@
> #include "discovery.h"
> #include "debug.h"
> #include "switchgroup.h"
> +#include "dm-generic.h"
> #include "print.h"
> #include "configure.h"
> #include "pgpolicies.h"
> diff --git a/libmultipath/dm-generic.c b/libmultipath/dm-generic.c
> index 42a26085d087..bdc9ca0a488b 100644
> --- a/libmultipath/dm-generic.c
> +++ b/libmultipath/dm-generic.c
> @@ -56,7 +56,7 @@ const struct gen_multipath_ops dm_gen_multipath_ops = {
> .get_pathgroups = dm_mp_get_pgs,
> .rel_pathgroups = dm_mp_rel_pgs,
> .snprint = snprint_multipath_attr,
> - /* .style = snprint_multipath_style, TBD */
> + .style = snprint_multipath_style,
> };
>
> const struct gen_pathgroup_ops dm_gen_pathgroup_ops = {
> diff --git a/libmultipath/print.c b/libmultipath/print.c
> index e9b8fdd6e581..8701a3584859 100644
> --- a/libmultipath/print.c
> +++ b/libmultipath/print.c
> @@ -30,7 +30,8 @@
> #include "debug.h"
> #include "discovery.h"
>
> -#define MAX(x,y) (x > y) ? x : y
> +#define MAX(x,y) (((x) > (y)) ? (x) : (y))
> +#define MIN(x,y) (((x) > (y)) ? (y) : (x))
> #define TAIL (line + len - 1 - c)
> #define NOPAD s = c
> #define PAD(x) \
> @@ -845,8 +846,8 @@ snprint_multipath_header (char * line, int len, const char * format)
> }
>
> int
> -snprint_multipath (char * line, int len, const char * format,
> - const struct multipath * mpp, int pad)
> +_snprint_multipath (const struct gen_multipath * gmp,
> + char * line, int len, const char * format, int pad)
> {
> char * c = line; /* line cursor */
> char * s = line; /* for padding */
> @@ -869,7 +870,7 @@ snprint_multipath (char * line, int len, const char * format,
> if (!(data = mpd_lookup(*f)))
> continue;
>
> - data->snprint(buff, MAX_FIELD_LEN, mpp);
> + gmp->ops->snprint(gmp, buff, MAX_FIELD_LEN, *f);
> PRINT(c, TAIL, "%s", buff);
> if (pad)
> PAD(data->width);
> @@ -912,8 +913,8 @@ snprint_path_header (char * line, int len, const char * format)
> }
>
> int
> -snprint_path (char * line, int len, const char * format,
> - const struct path * pp, int pad)
> +_snprint_path (const struct gen_path * gp, char * line, int len,
> + const char * format, int pad)
> {
> char * c = line; /* line cursor */
> char * s = line; /* for padding */
> @@ -936,7 +937,7 @@ snprint_path (char * line, int len, const char * format,
> if (!(data = pd_lookup(*f)))
> continue;
>
> - data->snprint(buff, MAX_FIELD_LEN, pp);
> + gp->ops->snprint(gp, buff, MAX_FIELD_LEN, *f);
> PRINT(c, TAIL, "%s", buff);
> if (pad)
> PAD(data->width);
> @@ -947,8 +948,8 @@ snprint_path (char * line, int len, const char * format,
> }
>
> int
> -snprint_pathgroup (char * line, int len, char * format,
> - const struct pathgroup * pgp)
> +_snprint_pathgroup (const struct gen_pathgroup * ggp, char * line, int len,
> + char * format)
> {
> char * c = line; /* line cursor */
> char * s = line; /* for padding */
> @@ -971,7 +972,7 @@ snprint_pathgroup (char * line, int len, char * format,
> if (!(data = pgd_lookup(*f)))
> continue;
>
> - data->snprint(buff, MAX_FIELD_LEN, pgp);
> + ggp->ops->snprint(ggp, buff, MAX_FIELD_LEN, *f);
> PRINT(c, TAIL, "%s", buff);
> PAD(data->width);
> } while (*f++);
> @@ -979,8 +980,10 @@ snprint_pathgroup (char * line, int len, char * format,
> __endline(line, len, c);
> return (c - line);
> }
> +#define snprint_pathgroup(line, len, fmt, pgp) \
> + _snprint_pathgroup(dm_pathgroup_to_gen(pgp), line, len, fmt)
>
> -void print_multipath_topology(struct multipath *mpp, int verbosity)
> +void _print_multipath_topology(const struct gen_multipath *gmp, int verbosity)
> {
> int resize;
> char *buff = NULL;
> @@ -997,7 +1000,7 @@ void print_multipath_topology(struct multipath *mpp, int verbosity)
> return;
> }
>
> - len = snprint_multipath_topology(buff, maxlen, mpp, verbosity);
> + len = _snprint_multipath_topology(gmp, buff, maxlen, verbosity);
> resize = (len == maxlen - 1);
>
> if (resize) {
> @@ -1010,12 +1013,30 @@ void print_multipath_topology(struct multipath *mpp, int verbosity)
> FREE(buff);
> }
>
> -int snprint_multipath_topology(char *buff, int len, const struct multipath *mpp,
> - int verbosity)
> +int
> +snprint_multipath_style(const struct gen_multipath *gmp, char *style, int len,
> + int verbosity)
> +{
> + int n;
> + const struct multipath *mpp = gen_multipath_to_dm(gmp);
> + bool need_action = (verbosity > 1 &&
> + mpp->action != ACT_NOTHING &&
> + mpp->action != ACT_UNDEF &&
> + mpp->action != ACT_IMPOSSIBLE);
> + bool need_wwid = (strncmp(mpp->alias, mpp->wwid, WWID_SIZE));
> +
> + n = snprintf(style, len, "%s%s%s%s",
> + need_action ? "%A: " : "", "%n",
> + need_wwid ? " (%w)" : "", " %d %s");
> + return MIN(n, len - 1);
> +}
> +
> +int _snprint_multipath_topology(const struct gen_multipath *gmp,
> + char *buff, int len, int verbosity)
> {
> int j, i, fwd = 0;
> - struct path * pp = NULL;
> - struct pathgroup * pgp = NULL;
> + const struct _vector *pgvec;
> + const struct gen_pathgroup *gpg;
> char style[64];
> char * c = style;
> char fmt[64];
> @@ -1027,60 +1048,70 @@ int snprint_multipath_topology(char *buff, int len, const struct multipath *mpp,
> reset_multipath_layout();
>
> if (verbosity == 1)
> - return snprint_multipath(buff, len, "%n", mpp, 1);
> + return _snprint_multipath(gmp, buff, len, "%n", 1);
>
> if(isatty(1))
> c += sprintf(c, "%c[%dm", 0x1B, 1); /* bold on */
>
> - if (verbosity > 1 &&
> - mpp->action != ACT_NOTHING &&
> - mpp->action != ACT_UNDEF && mpp->action != ACT_IMPOSSIBLE)
> - c += sprintf(c, "%%A: ");
> -
> - c += sprintf(c, "%%n");
> -
> - if (strncmp(mpp->alias, mpp->wwid, WWID_SIZE))
> - c += sprintf(c, " (%%w)");
> -
> - c += sprintf(c, " %%d %%s");
> + c += gmp->ops->style(gmp, c, sizeof(style) - (c - style),
> + verbosity);
> if(isatty(1))
> c += sprintf(c, "%c[%dm", 0x1B, 0); /* bold off */
>
> - fwd += snprint_multipath(buff + fwd, len - fwd, style, mpp, 1);
> + fwd += _snprint_multipath(gmp, buff + fwd, len - fwd, style, 1);
> if (fwd >= len)
> return len;
> - fwd += snprint_multipath(buff + fwd, len - fwd, PRINT_MAP_PROPS, mpp,
> - 1);
> + fwd += _snprint_multipath(gmp, buff + fwd, len - fwd,
> + PRINT_MAP_PROPS, 1);
> if (fwd >= len)
> return len;
>
> - if (!mpp->pg)
> + pgvec = gmp->ops->get_pathgroups(gmp);
> + if (pgvec == NULL)
> return fwd;
>
> - vector_foreach_slot (mpp->pg, pgp, j) {
> + vector_foreach_slot (pgvec, gpg, j) {
> + const struct _vector *pathvec;
> + struct gen_path *gp;
> +
> f=fmt;
> - if (j + 1 < VECTOR_SIZE(mpp->pg)) {
> +
> + if (j + 1 < VECTOR_SIZE(pgvec)) {
> strcpy(f, "|-+- " PRINT_PG_INDENT);
> } else
> strcpy(f, "`-+- " PRINT_PG_INDENT);
> - fwd += snprint_pathgroup(buff + fwd, len - fwd, fmt, pgp);
> - if (fwd >= len)
> - return len;
> + fwd += _snprint_pathgroup(gpg, buff + fwd, len - fwd, fmt);
>
> - vector_foreach_slot (pgp->paths, pp, i) {
> + if (fwd >= len) {
> + fwd = len;
> + break;
> + }
> +
> + pathvec = gpg->ops->get_paths(gpg);
> + if (pathvec == NULL)
> + continue;
> +
> + vector_foreach_slot (pathvec, gp, i) {
> f=fmt;
> if (*f != '|')
> *f=' ';
> f++;
> - if (i + 1 < VECTOR_SIZE(pgp->paths))
> + if (i + 1 < VECTOR_SIZE(pathvec))
> strcpy(f, " |- " PRINT_PATH_INDENT);
> else
> strcpy(f, " `- " PRINT_PATH_INDENT);
> - fwd += snprint_path(buff + fwd, len - fwd, fmt, pp, 1);
> - if (fwd >= len)
> - return len;
> + fwd += _snprint_path(gp, buff + fwd, len - fwd, fmt, 1);
> + if (fwd >= len) {
> + fwd = len;
> + break;
> + }
> }
> + gpg->ops->rel_paths(gpg, pathvec);
> +
> + if (fwd == len)
> + break;
> }
> + gmp->ops->rel_pathgroups(gmp, pgvec);
> return fwd;
> }
>
> diff --git a/libmultipath/print.h b/libmultipath/print.h
> index 214777c1e4f8..b8b9ecbd204f 100644
> --- a/libmultipath/print.h
> +++ b/libmultipath/print.h
> @@ -98,11 +98,17 @@ void get_path_layout (vector pathvec, int header);
> void get_multipath_layout (vector mpvec, int header);
> int snprint_path_header (char *, int, const char *);
> int snprint_multipath_header (char *, int, const char *);
> -int snprint_path (char *, int, const char *, const struct path *, int);
> -int snprint_multipath (char *, int, const char *,
> - const struct multipath *, int);
> -int snprint_multipath_topology (char *, int, const struct multipath * mpp,
> - int verbosity);
> +int _snprint_path (const struct gen_path *, char *, int, const char *, int);
> +#define snprint_path(buf, len, fmt, pp, v) \
> + _snprint_path(dm_path_to_gen(pp), buf, len, fmt, v)
> +int _snprint_multipath (const struct gen_multipath *, char *, int,
> + const char *, int);
> +#define snprint_multipath(buf, len, fmt, mp, v) \
> + _snprint_multipath(dm_multipath_to_gen(mp), buf, len, fmt, v)
> +int _snprint_multipath_topology (const struct gen_multipath *, char *, int,
> + int verbosity);
> +#define snprint_multipath_topology(buf, len, mpp, v) \
> + _snprint_multipath_topology (dm_multipath_to_gen(mpp), buf, len, v)
> int snprint_multipath_topology_json (char * buff, int len,
> const struct vectors * vecs);
> int snprint_multipath_map_json (char * buff, int len,
> @@ -123,7 +129,11 @@ int snprint_host_wwpn (char *, size_t, const struct path *);
> int snprint_tgt_wwnn (char *, size_t, const struct path *);
> int snprint_tgt_wwpn (char *, size_t, const struct path *);
>
> -void print_multipath_topology (struct multipath * mpp, int verbosity);
> +void _print_multipath_topology (const struct gen_multipath * gmp,
> + int verbosity);
> +#define print_multipath_topology(mpp, v) \
> + _print_multipath_topology(dm_multipath_to_gen(mpp), v)
> +
> void print_all_paths (vector pathvec, int banner);
> void print_all_paths_custo (vector pathvec, int banner, char *fmt);
>
> @@ -133,4 +143,6 @@ int snprint_pathgroup_attr(const struct gen_pathgroup* gpg,
> char *buf, int len, char wildcard);
> int snprint_multipath_attr(const struct gen_multipath* gm,
> char *buf, int len, char wildcard);
> +int snprint_multipath_style(const struct gen_multipath *gmp,
> + char *style, int len, int verbosity);
> #endif /* _PRINT_H */
> diff --git a/multipath/main.c b/multipath/main.c
> index 52bf1658bbca..a0c750e6f623 100644
> --- a/multipath/main.c
> +++ b/multipath/main.c
> @@ -47,6 +47,7 @@
> #include "discovery.h"
> #include "debug.h"
> #include "switchgroup.h"
> +#include "dm-generic.h"
> #include "print.h"
> #include "alias.h"
> #include "configure.h"
> diff --git a/multipathd/cli_handlers.c b/multipathd/cli_handlers.c
> index 7f13bc9d6f32..78f2a12bc2f8 100644
> --- a/multipathd/cli_handlers.c
> +++ b/multipathd/cli_handlers.c
> @@ -16,6 +16,7 @@
> #include "configure.h"
> #include "blacklist.h"
> #include "debug.h"
> +#include "dm-generic.h"
> #include "print.h"
> #include "sysfs.h"
> #include <errno.h>
> --
> 2.16.1
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